Automatic lockout for lamp-sockets



A. '1. KELLOGG.

AUTOMATIC LOCKOUT FOR LAMP S'OCKETS.

APPLICATION FILED JULYT. 1919.

1,345,09 1 Patented June 29, 1920.

HUNITED STATES PATENT, OFFICE.

AUTOMATIC LOCKOUT FOR LAMP-SOCKETS.

Specification of Letters Patent.

1,345,09 Patented June 29, 1920 Application filed my 7, 1919. Serial in.309,099.

T 0 all whom it may concern:

Be it known that I, ANDREW J. KELLooe, a citizen of the UnitedStates,residing at Acton, in the county of Los Angeles and State of California,have invented new and useful Improvements in Automatic 'Lock- 'outs forLamp-Sockets, of which the follow ing is a specification.

My object is to make an automatic lock out for lamp sockets, and myinvention consists of the novel features herein shown, described andclaimed.

One of the purposes of my automatic lock out for lamp sockets and thelike is to prevent unauthorized persons from removing the lamp andconnecting flat irons, coffee pots, toasters, heaters and the like tothe lamp socket, and the function of the lock out is that when the lampis removed an insulation is brought into: place over the contact so thatthe. plugs cannot be reinserted and electrically connected. The resultis that when a person removes a lamp to connect a utensil, the utensilcannot be electrically conshowing the parts in the lock out position,

Fig. 1 showing the parts in normal position for connecting the lamp andFig. 4 showing the parts in the lock out position. so that no lamp orplug can be electrically connected.

Fig. 5 is a view analogousto Fig. 3 and showing the parts in position asthey would be after the lamp is removed.

Fig. 6 shows the operation of removing the automatic lock out to restoreto its normal position for the reinsertion of a lamp.

Fig. 7 is an edge View of the automatic lock out shown in Figs. 1 and 4and as seen looking in the direction indicated by the arrow 7 in Fig. 8.

Fig. 8 is an enlarged plan view in detail I analogous to Fig. 4 andlooking in the direction indicated by the arrows 8 in Figs.

7 and 9.

line9-9 of Fig. .8.

Fig. 10 is an enlarged plan of the electric plug or connector carried bythe automatic lock out. 1 Fig. 11 is a diametrical cross section onthe-line 11-11 of Fig. 10.

The connector 1 is a circular button made of brass or other goodconducting material Fig. 9 isa diametrical cross section on the a andhas a flat periphery 2, a concave lower face 3, a concave upper face 4,and. a stop rim 5 extending outwardly from the periphcry 2 at'the upperside 4. I

I The connector 1 is mounted in a frame. 6.

The frame 6 is made of hard fiber or the like to insulate orelectrically isolate the connector. The frame 6 has a central opening 7in which the periphery 2 of the connector 1 fits slidingly, the rim 5serving to hold the connector 1 from sliding downwardly out ofthe frame.The frame 6 is fiat when seen edgewise, as in Fig. 7, and circular wheni seen sidewise, as in Fig. .8.

The frame 6 18 thick enough 'tocarry fitting the thread 9 of the lampsocket 10 so that the frame may be screwed into the lamp I out plate 14is mounted in a recess 15 formed from one side of the frame 6 andextending through slightly more than a quarter of the 7 area of the sideface of the frame and substantially half the thickness of the frame.This recess also mutilates the thread 8 without destroying its action.

The connector 1 normally is centrally located in the frame on a planeparallel with about two turns. of a thread 8, said thread 8 ,6 r

its axis, and the cut out plate 14 is connected I at its outer end by apivot pin 16, and the free end of the plate 14- bears against theperiphery 2 of the connector 1 thereby resisting the tension of thespring 12 and holding the parts in normal position.

Pinholes 17 and 18 are formed from the lower face of the frame 6diametrically opposite each other for the insertion of a span ner key 19in screwing the frame in and out.

The automatic lock outs are prepared 12 willswing the plates inwardlyin'front of the connectors 1, and the lamps cannot be plugs cannot beelectricallyconnected to the sockets for the operation of flat irons and1 the like; The lamp sockets are out of comwith the parts in theirnormal positions as shown in Fig. 1, and when it is desired to insert alock out into a lamp socket the spanner key 19 is applied and has pins20 and 21 fitting in the pin holes 17 and 18 and a handle 22 formanipulation.

The automatic lockout is inserted into the lamp socket with the stop rimfiengaging the inner side of the frame 6 and the pivoted cut-out plate14 on theouter side of said frame; and when the cut-out is screwed upinto the socket 10 the inner face of the frame 6 will stop at the innerend of the threadi),

and when the lamp 23 is screwed into the socket the lamp contact 2 1will bear against the outer face of the connector 1 and press theconnector inwardly relative to said frame, thereby moving the connectorlaterally out of the place of the cut-out plate let and pressing theconnector 1 against the contact 25 thereby electrically connecting thelamp to the socket.

During this time the cut out plates 14 bear against the contacts 2 f,but as soon as the lamps are unscrewed even a turn or so or removed fromthe sockets the cut out plates 14: are released, and the tensions of thewires replaced and electrically connected and mission until the lockouts are removed and restored to their normal positions.

Thus I have produced an automatic lock out for lamp sockets and the likecomprising a frame adapted to be screwed into the lamp sockets ahead ofthe'lamp and having a connector normally holding an insulation plate andadapted to be displaced by screwing the 'lamp in so as to release theinsulation plate able in the direction of movement of the err-=- teringlamp, a pivoted insulating plate carried by the frame biased to moveover the center contact aperture and normally held from such position byengagement withthe center contact.

2. An automatic lock' out forlamp sockets comprising the combinationwith a lamp socket and a lamp, of means screwed into the lamp socketincluding an insulating element mounted on said-means to swing over thesocket contact when thelamp'is re moved. V

In testimonywhereof I have signed name to this specification ANDRE.W J.nLLoG l

